solving equations using substitution pratice
1. Solve the equation 3x - 5 = 7 using substitution.
First, isolate the variable by adding 5 to both sides of the equation:
3x - 5 + 5 = 7 + 5
3x = 12
Next, divide by 3 to solve for x:
3x/3 = 12/3
x = 4
Therefore, the solution to the equation 3x - 5 = 7 is x = 4.
2. Solve the equation 2y + 8 = 14 using substitution.
First, isolate the variable by subtracting 8 from both sides of the equation:
2y + 8 - 8 = 14 - 8
2y = 6
Next, divide by 2 to solve for y:
2y/2 = 6/2
y = 3
Therefore, the solution to the equation 2y + 8 = 14 is y = 3.